In 1959, Tiberiu Popoviciu reactivated the journal, being its Editor-in-Chief until 1975. The journal was edited at and published under the auspices of the Romanian Society of Mathematical Sciences (SSMR), T. Popoviciu being the president of the Cluj branch.

In 1975, in “a momentary lapse of reason”, the communist president N. Ceaușescu dissolved all the three mathematical institutes of the Romanian Academy (at Bucharest, Iaşi and Cluj-Napoca). The reasons were obviously subjective (his daughter, Zoe, was working at the Institute of Mathematics from Bucharest), and were not connected to the outstanding activity and results obtained by the institutes.

Moreover, out of three mathematical journals edited at Cluj-Napoca under the auspices of the Romanian Academy (the two journals mentioned above, plus Mathematica) the communist regime allowed only one. Curiously enough, the request of the mathematicians that the journals Rev. Anal. Numér. Théorie Approximation and Mathematica to merge into a single one, with merged titles (but different subtitles, and with unchanged number of issues per year), was approved (sic!). In this way, Mathematica was continued by Mathematica – Revue d’analyse numérique et de théorie de l’approximation. Mathematica. These tragic events caused the death of T. Popoviciu (as well as of acad. Miron Nicolescu, in Bucharest, and of acad. Mendel Haimovici in Iaşi).